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Prove that cos 6^(@) cos 42^(@) cos 66...

Prove that cos `6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)`

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Prove that sin 6^(@) sin 42^(@) sin 66^(@) sin 78^(@) = (1)/(16) .

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Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

cos20 ^ (@) cos40 ^ (@) cos60 ^ (@) cos80 ^ (@) - (1) / (16) =

Prove that :cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that: cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)